Calipers.



H. SAUTER. UALIPERS.

APPLIQATIOR IILED APB-.8, 1910.

Patnted Aug. 9, 1910.

Wye??? THE NORRIS PETERS co., WASHINGTON, u. c.

UNITED STATES PATENT osmon HERMAN SAU'IER, OF CHICAGO, ILLINOIS, ASSIGNOR TO GILBERT, HARRIS & COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

cALIPERs.

Specification of Letters Patent.

Patented Aug. 9, 1910.

Application filed April 8, 1910. Serial No. 554,132.

To all whom it may concern:

Be it known that I, HERMAN SAU'IER, a

citizen of the United States,

the following is a specification.

This invention relates to micrometers and calipers and its object is to provide a device by which, when a workman has taken the measurement of one of a pair of interfitting parts with one pair of calipers, and desires to set another pair of calipers to the first pair in order to measure the other interfitt-ing part, this may be done without the great difficultywhich all workmen experience in trying to hold the points of the two adjacent pairs of calipers in contact with each other.

The invention consists in the application to one of the points of one of the pairs of calipers of a guide socket, head or clip adapted to be engaged by the adjacent point of the second pair of calipers to hold the points of the two pairs of calipers together while the workman is adjusting the other adjacent points.

In the drawings Figure 1 shows one pair of calipers in the position which they assume when measuring the diameter of a hole in a metal plate. Fig. 2 shows the same pair of calipers when bein fitted within another pair of calipers for the purpose of adjusting the second pair of calipers to proper size for use in making a shaft for use in fitting within the hole shown in Fig. 1. Fig. 3 is a detail view ofthe guide device applied to one arm or end of a pair of calipers. Fig. 4 shows the same guide device removed from the calipers.

The calipers illustrated in the drawings form, with the exception of that part which is covered by this application, the subject matter of my prior patent application Serial No. 520,709, filed October 2, 1909.

As heretofore stated in general terms, Fig.

1 shows a plate of metal 10 having a circular hole 12 therein within which the two contact points 14 and 16 of one pair of calipers have just been fitted, these points 14 and 16 being carried on arms 18 and 20 adjustably secured by screws 22 and 24 upon a rod 26. For convenience this pair of calipers will throughout be referred to as the first pair.

in the county of Cook and State 1 of Illinois, have invented a certain new and useful Improvement in Calipers, of which The second pair of calipers to be hereafter referred to consists in an arch shaped member 26 having a contact point 28 rotatable by means of the milled head 30 and adjustably secured by the set screw 32. In line with this first contact point 28 is a rod 3-1 slidably mounted through the arch shaped member and held in adj ustment by means of the screw 36. In the particular case here illustrated this second. caliper is to be used to determine the proper diameter needed in making a shaft 38 which is to go inside of the hole 12 in plate 10. On the inner end of the rod 34 0f the second caliper is a working contact point 40 of less diameter than the body of the rod 342 said point having at its base a shoulder 42. Slidable over this working member 40 and adapted to fit against this shoulder 42 is a cap, clip or guide member 4+1, preferably of circular form, and of a greater length than the length of working member 40 above shoulder 42. It will only require a glance at the drawings to see that when the point 16 of the first caliper is fitted into this opening 46, as is shown in Fig. 2, this working point 16 will be so held in contact with working point 4-0, particularly against lateral movement of one to the other that all the workmanhas to give his attention to .is in seeing that he properly adjusts the point 28 of the second caliper to point 14: of the first caliper or that, if the calipers are being used in carrying out a corresponding but reverse operation, the micrometer screw 48 is prop erly adjusted to bring working point 14L into contact with working point 28.

In order to allow of ready adjustment of the calipers, one to the other, the outer end of opening 46 tapers slightly inward so that when the calipers are in the position of Fig. 2, a slight pivotal movement of one caliper to the other is possible without separating them.

As it is manifestly impossible for the second caliper to be used in measuring a shaft with the guiding device 44 in place, said guiding device is necessarily removable from the working end 40 of said second caliper. I11 order to facilitate this removability the guiding device 44: has preferably a series of splits or cuts 50 formed therein in the ordinary manner so that it readily and positively engages working end 40 but is removable therefrom.

It is, of course, entirely obvious that the constructor of the device may, without departing from this invention, place this guiding device 44 on the opposite Working point 28 of the second caliper or upon either working point of the first caliper, as desired.

Having thus described the invention what- I claim as new and desire to secure by Let-- ters Patent is: Y 1. In combination with a caliper having two opposed contact points, a guide adapted to be detachably attached about one of said contact points and adapted to retain the contact point of another caliper placed in contact with the point within said guide, against side Ways movement with reference thereto.

2. In a caliper, a working rod or arm having near its end a shoulder from which extends the contact point member proper of the caliper, a hollow tubular guide member of greater length than the contact point member, adapted to slide over said latter member and fit against said shoulder in detachable engagement therewith, the opening in said guide member being such that the contact point of another caliper) may be inserted therein into contact with the contact point about which said guide member is fitted for the purpose set forth.

In witness whereof, I have hereunto sub scribed my name in the presence of two Witnesses.

HERMAN SAUTER.

Vitnesses DWIGHT B. CI-IEEVER, GLENN IV, I'IARRIS. 

